Oh yeah, the coding and features of MS Server are much better than their client OS’s. For instance, in Enterprise/Datacenter editions the 32bit versions support (and fully utilize) up to 64GB of ram. Server03 Enterprise/Datacenter could also do this. 32bit doesn’t limit you to 4GB, as is the common misconception, it only limits you to 4GB if the OS uses the standard (aka ancient) paging system.
Feature comparison, interesting read.
http://www.directionsonmicrosoft.com/sample/DOMIS/update/2008/02feb/0208ws2plp_ch.htm